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<pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (c) 2004-2011 QOS.ch<a name="line.2"></a>
<span class="sourceLineNo">003</span> * All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * Permission is hereby granted, free  of charge, to any person obtaining<a name="line.5"></a>
<span class="sourceLineNo">006</span> * a  copy  of this  software  and  associated  documentation files  (the<a name="line.6"></a>
<span class="sourceLineNo">007</span> * "Software"), to  deal in  the Software without  restriction, including<a name="line.7"></a>
<span class="sourceLineNo">008</span> * without limitation  the rights to  use, copy, modify,  merge, publish,<a name="line.8"></a>
<span class="sourceLineNo">009</span> * distribute,  sublicense, and/or sell  copies of  the Software,  and to<a name="line.9"></a>
<span class="sourceLineNo">010</span> * permit persons to whom the Software  is furnished to do so, subject to<a name="line.10"></a>
<span class="sourceLineNo">011</span> * the following conditions:<a name="line.11"></a>
<span class="sourceLineNo">012</span> *<a name="line.12"></a>
<span class="sourceLineNo">013</span> * The  above  copyright  notice  and  this permission  notice  shall  be<a name="line.13"></a>
<span class="sourceLineNo">014</span> * included in all copies or substantial portions of the Software.<a name="line.14"></a>
<span class="sourceLineNo">015</span> *<a name="line.15"></a>
<span class="sourceLineNo">016</span> * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,<a name="line.16"></a>
<span class="sourceLineNo">017</span> * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF<a name="line.17"></a>
<span class="sourceLineNo">018</span> * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND<a name="line.18"></a>
<span class="sourceLineNo">019</span> * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE<a name="line.19"></a>
<span class="sourceLineNo">020</span> * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION<a name="line.20"></a>
<span class="sourceLineNo">021</span> * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION<a name="line.21"></a>
<span class="sourceLineNo">022</span> * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.<a name="line.22"></a>
<span class="sourceLineNo">023</span> *<a name="line.23"></a>
<span class="sourceLineNo">024</span> */<a name="line.24"></a>
<span class="sourceLineNo">025</span>/**<a name="line.25"></a>
<span class="sourceLineNo">026</span> *<a name="line.26"></a>
<span class="sourceLineNo">027</span> */<a name="line.27"></a>
<span class="sourceLineNo">028</span>package org.slf4j.instrumentation;<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>import static org.slf4j.helpers.MessageFormatter.format;<a name="line.30"></a>
<span class="sourceLineNo">031</span><a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.io.ByteArrayInputStream;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import java.lang.instrument.ClassFileTransformer;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import java.security.ProtectionDomain;<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span>import javassist.CannotCompileException;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import javassist.ClassPool;<a name="line.37"></a>
<span class="sourceLineNo">038</span>import javassist.CtBehavior;<a name="line.38"></a>
<span class="sourceLineNo">039</span>import javassist.CtClass;<a name="line.39"></a>
<span class="sourceLineNo">040</span>import javassist.CtField;<a name="line.40"></a>
<span class="sourceLineNo">041</span>import javassist.NotFoundException;<a name="line.41"></a>
<span class="sourceLineNo">042</span><a name="line.42"></a>
<span class="sourceLineNo">043</span>import org.slf4j.helpers.MessageFormatter;<a name="line.43"></a>
<span class="sourceLineNo">044</span><a name="line.44"></a>
<span class="sourceLineNo">045</span>/**<a name="line.45"></a>
<span class="sourceLineNo">046</span> * &lt;p&gt;<a name="line.46"></a>
<span class="sourceLineNo">047</span> * LogTransformer does the work of analyzing each class, and if appropriate add<a name="line.47"></a>
<span class="sourceLineNo">048</span> * log statements to each method to allow logging entry/exit.<a name="line.48"></a>
<span class="sourceLineNo">049</span> * &lt;/p&gt;<a name="line.49"></a>
<span class="sourceLineNo">050</span> * &lt;p&gt;<a name="line.50"></a>
<span class="sourceLineNo">051</span> * This class is based on the article &lt;a href="http://today.java.net/pub/a/today/2008/04/24/add-logging-at-class-load-time-with-instrumentation.html"<a name="line.51"></a>
<span class="sourceLineNo">052</span> * &gt;Add Logging at Class Load Time with Java Instrumentation&lt;/a&gt;.<a name="line.52"></a>
<span class="sourceLineNo">053</span> * &lt;/p&gt;<a name="line.53"></a>
<span class="sourceLineNo">054</span> */<a name="line.54"></a>
<span class="sourceLineNo">055</span>public class LogTransformer implements ClassFileTransformer {<a name="line.55"></a>
<span class="sourceLineNo">056</span><a name="line.56"></a>
<span class="sourceLineNo">057</span>    /**<a name="line.57"></a>
<span class="sourceLineNo">058</span>     * Builder provides a flexible way of configuring some of many options on the<a name="line.58"></a>
<span class="sourceLineNo">059</span>     * parent class instead of providing many constructors.<a name="line.59"></a>
<span class="sourceLineNo">060</span>     *<a name="line.60"></a>
<span class="sourceLineNo">061</span>     * &lt;a href="http://rwhansen.blogspot.com/2007/07/theres-builder-pattern-that-joshua.html"&gt;http://rwhansen.blogspot.com/2007/07/theres-builder-pattern-that-joshua.html&lt;/a&gt;<a name="line.61"></a>
<span class="sourceLineNo">062</span>     *<a name="line.62"></a>
<span class="sourceLineNo">063</span>     */<a name="line.63"></a>
<span class="sourceLineNo">064</span>    public static class Builder {<a name="line.64"></a>
<span class="sourceLineNo">065</span><a name="line.65"></a>
<span class="sourceLineNo">066</span>        /**<a name="line.66"></a>
<span class="sourceLineNo">067</span>         * Build and return the LogTransformer corresponding to the options set in<a name="line.67"></a>
<span class="sourceLineNo">068</span>         * this Builder.<a name="line.68"></a>
<span class="sourceLineNo">069</span>         *<a name="line.69"></a>
<span class="sourceLineNo">070</span>         * @return<a name="line.70"></a>
<span class="sourceLineNo">071</span>         */<a name="line.71"></a>
<span class="sourceLineNo">072</span>        public LogTransformer build() {<a name="line.72"></a>
<span class="sourceLineNo">073</span>            if (verbose) {<a name="line.73"></a>
<span class="sourceLineNo">074</span>                System.err.println("Creating LogTransformer");<a name="line.74"></a>
<span class="sourceLineNo">075</span>            }<a name="line.75"></a>
<span class="sourceLineNo">076</span>            return new LogTransformer(this);<a name="line.76"></a>
<span class="sourceLineNo">077</span>        }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>        boolean addEntryExit;<a name="line.79"></a>
<span class="sourceLineNo">080</span><a name="line.80"></a>
<span class="sourceLineNo">081</span>        /**<a name="line.81"></a>
<span class="sourceLineNo">082</span>         * Should each method log entry (with parameters) and exit (with parameters<a name="line.82"></a>
<span class="sourceLineNo">083</span>         * and return value)?<a name="line.83"></a>
<span class="sourceLineNo">084</span>         *<a name="line.84"></a>
<span class="sourceLineNo">085</span>         * @param b<a name="line.85"></a>
<span class="sourceLineNo">086</span>         *          value of flag<a name="line.86"></a>
<span class="sourceLineNo">087</span>         * @return<a name="line.87"></a>
<span class="sourceLineNo">088</span>         */<a name="line.88"></a>
<span class="sourceLineNo">089</span>        public Builder addEntryExit(boolean b) {<a name="line.89"></a>
<span class="sourceLineNo">090</span>            addEntryExit = b;<a name="line.90"></a>
<span class="sourceLineNo">091</span>            return this;<a name="line.91"></a>
<span class="sourceLineNo">092</span>        }<a name="line.92"></a>
<span class="sourceLineNo">093</span><a name="line.93"></a>
<span class="sourceLineNo">094</span>        boolean addVariableAssignment;<a name="line.94"></a>
<span class="sourceLineNo">095</span><a name="line.95"></a>
<span class="sourceLineNo">096</span>        // private Builder addVariableAssignment(boolean b) {<a name="line.96"></a>
<span class="sourceLineNo">097</span>        // System.err.println("cannot currently log variable assignments.");<a name="line.97"></a>
<span class="sourceLineNo">098</span>        // addVariableAssignment = b;<a name="line.98"></a>
<span class="sourceLineNo">099</span>        // return this;<a name="line.99"></a>
<span class="sourceLineNo">100</span>        // }<a name="line.100"></a>
<span class="sourceLineNo">101</span><a name="line.101"></a>
<span class="sourceLineNo">102</span>        boolean verbose;<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span>        /**<a name="line.104"></a>
<span class="sourceLineNo">105</span>         * Should LogTransformer be verbose in what it does? This currently list the<a name="line.105"></a>
<span class="sourceLineNo">106</span>         * names of the classes being processed.<a name="line.106"></a>
<span class="sourceLineNo">107</span>         *<a name="line.107"></a>
<span class="sourceLineNo">108</span>         * @param b<a name="line.108"></a>
<span class="sourceLineNo">109</span>         * @return<a name="line.109"></a>
<span class="sourceLineNo">110</span>         */<a name="line.110"></a>
<span class="sourceLineNo">111</span>        public Builder verbose(boolean b) {<a name="line.111"></a>
<span class="sourceLineNo">112</span>            verbose = b;<a name="line.112"></a>
<span class="sourceLineNo">113</span>            return this;<a name="line.113"></a>
<span class="sourceLineNo">114</span>        }<a name="line.114"></a>
<span class="sourceLineNo">115</span><a name="line.115"></a>
<span class="sourceLineNo">116</span>        String[] ignore = { "org/slf4j/", "ch/qos/logback/", "org/apache/log4j/" };<a name="line.116"></a>
<span class="sourceLineNo">117</span><a name="line.117"></a>
<span class="sourceLineNo">118</span>        public Builder ignore(String[] strings) {<a name="line.118"></a>
<span class="sourceLineNo">119</span>            this.ignore = strings;<a name="line.119"></a>
<span class="sourceLineNo">120</span>            return this;<a name="line.120"></a>
<span class="sourceLineNo">121</span>        }<a name="line.121"></a>
<span class="sourceLineNo">122</span><a name="line.122"></a>
<span class="sourceLineNo">123</span>        private String level = "info";<a name="line.123"></a>
<span class="sourceLineNo">124</span><a name="line.124"></a>
<span class="sourceLineNo">125</span>        public Builder level(String level) {<a name="line.125"></a>
<span class="sourceLineNo">126</span>            level = level.toLowerCase();<a name="line.126"></a>
<span class="sourceLineNo">127</span>            if (level.equals("info") || level.equals("debug") || level.equals("trace")) {<a name="line.127"></a>
<span class="sourceLineNo">128</span>                this.level = level;<a name="line.128"></a>
<span class="sourceLineNo">129</span>            } else {<a name="line.129"></a>
<span class="sourceLineNo">130</span>                if (verbose) {<a name="line.130"></a>
<span class="sourceLineNo">131</span>                    System.err.println("level not info/debug/trace : " + level);<a name="line.131"></a>
<span class="sourceLineNo">132</span>                }<a name="line.132"></a>
<span class="sourceLineNo">133</span>            }<a name="line.133"></a>
<span class="sourceLineNo">134</span>            return this;<a name="line.134"></a>
<span class="sourceLineNo">135</span>        }<a name="line.135"></a>
<span class="sourceLineNo">136</span>    }<a name="line.136"></a>
<span class="sourceLineNo">137</span><a name="line.137"></a>
<span class="sourceLineNo">138</span>    private String level;<a name="line.138"></a>
<span class="sourceLineNo">139</span>    private String levelEnabled;<a name="line.139"></a>
<span class="sourceLineNo">140</span><a name="line.140"></a>
<span class="sourceLineNo">141</span>    private LogTransformer(Builder builder) {<a name="line.141"></a>
<span class="sourceLineNo">142</span>        String s = "WARNING: javassist not available on classpath for javaagent, log statements will not be added";<a name="line.142"></a>
<span class="sourceLineNo">143</span>        try {<a name="line.143"></a>
<span class="sourceLineNo">144</span>            if (Class.forName("javassist.ClassPool") == null) {<a name="line.144"></a>
<span class="sourceLineNo">145</span>                System.err.println(s);<a name="line.145"></a>
<span class="sourceLineNo">146</span>            }<a name="line.146"></a>
<span class="sourceLineNo">147</span>        } catch (ClassNotFoundException e) {<a name="line.147"></a>
<span class="sourceLineNo">148</span>            System.err.println(s);<a name="line.148"></a>
<span class="sourceLineNo">149</span>        }<a name="line.149"></a>
<span class="sourceLineNo">150</span><a name="line.150"></a>
<span class="sourceLineNo">151</span>        this.addEntryExit = builder.addEntryExit;<a name="line.151"></a>
<span class="sourceLineNo">152</span>        // this.addVariableAssignment = builder.addVariableAssignment;<a name="line.152"></a>
<span class="sourceLineNo">153</span>        this.verbose = builder.verbose;<a name="line.153"></a>
<span class="sourceLineNo">154</span>        this.ignore = builder.ignore;<a name="line.154"></a>
<span class="sourceLineNo">155</span>        this.level = builder.level;<a name="line.155"></a>
<span class="sourceLineNo">156</span>        this.levelEnabled = "is" + builder.level.substring(0, 1).toUpperCase() + builder.level.substring(1) + "Enabled";<a name="line.156"></a>
<span class="sourceLineNo">157</span>    }<a name="line.157"></a>
<span class="sourceLineNo">158</span><a name="line.158"></a>
<span class="sourceLineNo">159</span>    private boolean addEntryExit;<a name="line.159"></a>
<span class="sourceLineNo">160</span>    // private boolean addVariableAssignment;<a name="line.160"></a>
<span class="sourceLineNo">161</span>    private boolean verbose;<a name="line.161"></a>
<span class="sourceLineNo">162</span>    private String[] ignore;<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>
<span class="sourceLineNo">164</span>    public byte[] transform(ClassLoader loader, String className, Class&lt;?&gt; clazz, ProtectionDomain domain, byte[] bytes) {<a name="line.164"></a>
<span class="sourceLineNo">165</span><a name="line.165"></a>
<span class="sourceLineNo">166</span>        try {<a name="line.166"></a>
<span class="sourceLineNo">167</span>            return transform0(className, clazz, domain, bytes);<a name="line.167"></a>
<span class="sourceLineNo">168</span>        } catch (Exception e) {<a name="line.168"></a>
<span class="sourceLineNo">169</span>            System.err.println("Could not instrument " + className);<a name="line.169"></a>
<span class="sourceLineNo">170</span>            e.printStackTrace();<a name="line.170"></a>
<span class="sourceLineNo">171</span>            return bytes;<a name="line.171"></a>
<span class="sourceLineNo">172</span>        }<a name="line.172"></a>
<span class="sourceLineNo">173</span>    }<a name="line.173"></a>
<span class="sourceLineNo">174</span><a name="line.174"></a>
<span class="sourceLineNo">175</span>    /**<a name="line.175"></a>
<span class="sourceLineNo">176</span>     * transform0 sees if the className starts with any of the namespaces to<a name="line.176"></a>
<span class="sourceLineNo">177</span>     * ignore, if so it is returned unchanged. Otherwise it is processed by<a name="line.177"></a>
<span class="sourceLineNo">178</span>     * doClass(...)<a name="line.178"></a>
<span class="sourceLineNo">179</span>     *<a name="line.179"></a>
<span class="sourceLineNo">180</span>     * @param className<a name="line.180"></a>
<span class="sourceLineNo">181</span>     * @param clazz<a name="line.181"></a>
<span class="sourceLineNo">182</span>     * @param domain<a name="line.182"></a>
<span class="sourceLineNo">183</span>     * @param bytes<a name="line.183"></a>
<span class="sourceLineNo">184</span>     * @return<a name="line.184"></a>
<span class="sourceLineNo">185</span>     */<a name="line.185"></a>
<span class="sourceLineNo">186</span><a name="line.186"></a>
<span class="sourceLineNo">187</span>    private byte[] transform0(String className, Class&lt;?&gt; clazz, ProtectionDomain domain, byte[] bytes) {<a name="line.187"></a>
<span class="sourceLineNo">188</span><a name="line.188"></a>
<span class="sourceLineNo">189</span>        try {<a name="line.189"></a>
<span class="sourceLineNo">190</span>            for (int i = 0; i &lt; ignore.length; i++) {<a name="line.190"></a>
<span class="sourceLineNo">191</span>                if (className.startsWith(ignore[i])) {<a name="line.191"></a>
<span class="sourceLineNo">192</span>                    return bytes;<a name="line.192"></a>
<span class="sourceLineNo">193</span>                }<a name="line.193"></a>
<span class="sourceLineNo">194</span>            }<a name="line.194"></a>
<span class="sourceLineNo">195</span>            String slf4jName = "org.slf4j.LoggerFactory";<a name="line.195"></a>
<span class="sourceLineNo">196</span>            try {<a name="line.196"></a>
<span class="sourceLineNo">197</span>                if (domain != null &amp;&amp; domain.getClassLoader() != null) {<a name="line.197"></a>
<span class="sourceLineNo">198</span>                    domain.getClassLoader().loadClass(slf4jName);<a name="line.198"></a>
<span class="sourceLineNo">199</span>                } else {<a name="line.199"></a>
<span class="sourceLineNo">200</span>                    if (verbose) {<a name="line.200"></a>
<span class="sourceLineNo">201</span>                        System.err.println("Skipping " + className + " as it doesn't have a domain or a class loader.");<a name="line.201"></a>
<span class="sourceLineNo">202</span>                    }<a name="line.202"></a>
<span class="sourceLineNo">203</span>                    return bytes;<a name="line.203"></a>
<span class="sourceLineNo">204</span>                }<a name="line.204"></a>
<span class="sourceLineNo">205</span>            } catch (ClassNotFoundException e) {<a name="line.205"></a>
<span class="sourceLineNo">206</span>                if (verbose) {<a name="line.206"></a>
<span class="sourceLineNo">207</span>                    System.err.println("Skipping " + className + " as slf4j is not available to it");<a name="line.207"></a>
<span class="sourceLineNo">208</span>                }<a name="line.208"></a>
<span class="sourceLineNo">209</span>                return bytes;<a name="line.209"></a>
<span class="sourceLineNo">210</span>            }<a name="line.210"></a>
<span class="sourceLineNo">211</span>            if (verbose) {<a name="line.211"></a>
<span class="sourceLineNo">212</span>                System.err.println("Processing " + className);<a name="line.212"></a>
<span class="sourceLineNo">213</span>            }<a name="line.213"></a>
<span class="sourceLineNo">214</span>            return doClass(className, clazz, bytes);<a name="line.214"></a>
<span class="sourceLineNo">215</span>        } catch (Throwable e) {<a name="line.215"></a>
<span class="sourceLineNo">216</span>            System.out.println("e = " + e);<a name="line.216"></a>
<span class="sourceLineNo">217</span>            return bytes;<a name="line.217"></a>
<span class="sourceLineNo">218</span>        }<a name="line.218"></a>
<span class="sourceLineNo">219</span>    }<a name="line.219"></a>
<span class="sourceLineNo">220</span><a name="line.220"></a>
<span class="sourceLineNo">221</span>    private String loggerName;<a name="line.221"></a>
<span class="sourceLineNo">222</span><a name="line.222"></a>
<span class="sourceLineNo">223</span>    /**<a name="line.223"></a>
<span class="sourceLineNo">224</span>     * doClass() process a single class by first creates a class description from<a name="line.224"></a>
<span class="sourceLineNo">225</span>     * the byte codes. If it is a class (i.e. not an interface) the methods<a name="line.225"></a>
<span class="sourceLineNo">226</span>     * defined have bodies, and a static final logger object is added with the<a name="line.226"></a>
<span class="sourceLineNo">227</span>     * name of this class as an argument, and each method then gets processed with<a name="line.227"></a>
<span class="sourceLineNo">228</span>     * doMethod(...) to have logger calls added.<a name="line.228"></a>
<span class="sourceLineNo">229</span>     *<a name="line.229"></a>
<span class="sourceLineNo">230</span>     * @param name<a name="line.230"></a>
<span class="sourceLineNo">231</span>     *          class name (slashes separate, not dots)<a name="line.231"></a>
<span class="sourceLineNo">232</span>     * @param clazz<a name="line.232"></a>
<span class="sourceLineNo">233</span>     * @param b<a name="line.233"></a>
<span class="sourceLineNo">234</span>     * @return<a name="line.234"></a>
<span class="sourceLineNo">235</span>     */<a name="line.235"></a>
<span class="sourceLineNo">236</span>    private byte[] doClass(String name, Class&lt;?&gt; clazz, byte[] b) {<a name="line.236"></a>
<span class="sourceLineNo">237</span>        ClassPool pool = ClassPool.getDefault();<a name="line.237"></a>
<span class="sourceLineNo">238</span>        CtClass cl = null;<a name="line.238"></a>
<span class="sourceLineNo">239</span>        try {<a name="line.239"></a>
<span class="sourceLineNo">240</span>            cl = pool.makeClass(new ByteArrayInputStream(b));<a name="line.240"></a>
<span class="sourceLineNo">241</span>            if (cl.isInterface() == false) {<a name="line.241"></a>
<span class="sourceLineNo">242</span><a name="line.242"></a>
<span class="sourceLineNo">243</span>                loggerName = "_____log";<a name="line.243"></a>
<span class="sourceLineNo">244</span><a name="line.244"></a>
<span class="sourceLineNo">245</span>                // We have to declare the log variable.<a name="line.245"></a>
<span class="sourceLineNo">246</span><a name="line.246"></a>
<span class="sourceLineNo">247</span>                String pattern1 = "private static org.slf4j.Logger {};";<a name="line.247"></a>
<span class="sourceLineNo">248</span>                String loggerDefinition = format(pattern1, loggerName).getMessage();<a name="line.248"></a>
<span class="sourceLineNo">249</span>                CtField field = CtField.make(loggerDefinition, cl);<a name="line.249"></a>
<span class="sourceLineNo">250</span><a name="line.250"></a>
<span class="sourceLineNo">251</span>                // and assign it the appropriate value.<a name="line.251"></a>
<span class="sourceLineNo">252</span><a name="line.252"></a>
<span class="sourceLineNo">253</span>                String pattern2 = "org.slf4j.LoggerFactory.getLogger({}.class);";<a name="line.253"></a>
<span class="sourceLineNo">254</span>                String replace = name.replace('/', '.');<a name="line.254"></a>
<span class="sourceLineNo">255</span>                String getLogger = format(pattern2, replace).getMessage();<a name="line.255"></a>
<span class="sourceLineNo">256</span><a name="line.256"></a>
<span class="sourceLineNo">257</span>                cl.addField(field, getLogger);<a name="line.257"></a>
<span class="sourceLineNo">258</span><a name="line.258"></a>
<span class="sourceLineNo">259</span>                // then check every behaviour (which includes methods). We are<a name="line.259"></a>
<span class="sourceLineNo">260</span>                // only<a name="line.260"></a>
<span class="sourceLineNo">261</span>                // interested in non-empty ones, as they have code.<a name="line.261"></a>
<span class="sourceLineNo">262</span>                // NOTE: This will be changed, as empty methods should be<a name="line.262"></a>
<span class="sourceLineNo">263</span>                // instrumented too.<a name="line.263"></a>
<span class="sourceLineNo">264</span><a name="line.264"></a>
<span class="sourceLineNo">265</span>                CtBehavior[] methods = cl.getDeclaredBehaviors();<a name="line.265"></a>
<span class="sourceLineNo">266</span>                for (int i = 0; i &lt; methods.length; i++) {<a name="line.266"></a>
<span class="sourceLineNo">267</span>                    if (methods[i].isEmpty() == false) {<a name="line.267"></a>
<span class="sourceLineNo">268</span>                        doMethod(methods[i]);<a name="line.268"></a>
<span class="sourceLineNo">269</span>                    }<a name="line.269"></a>
<span class="sourceLineNo">270</span>                }<a name="line.270"></a>
<span class="sourceLineNo">271</span>                b = cl.toBytecode();<a name="line.271"></a>
<span class="sourceLineNo">272</span>            }<a name="line.272"></a>
<span class="sourceLineNo">273</span>        } catch (Exception e) {<a name="line.273"></a>
<span class="sourceLineNo">274</span>            System.err.println("Could not instrument " + name + ", " + e);<a name="line.274"></a>
<span class="sourceLineNo">275</span>            e.printStackTrace(System.err);<a name="line.275"></a>
<span class="sourceLineNo">276</span>        } finally {<a name="line.276"></a>
<span class="sourceLineNo">277</span>            if (cl != null) {<a name="line.277"></a>
<span class="sourceLineNo">278</span>                cl.detach();<a name="line.278"></a>
<span class="sourceLineNo">279</span>            }<a name="line.279"></a>
<span class="sourceLineNo">280</span>        }<a name="line.280"></a>
<span class="sourceLineNo">281</span>        return b;<a name="line.281"></a>
<span class="sourceLineNo">282</span>    }<a name="line.282"></a>
<span class="sourceLineNo">283</span><a name="line.283"></a>
<span class="sourceLineNo">284</span>    /**<a name="line.284"></a>
<span class="sourceLineNo">285</span>     * process a single method - this means add entry/exit logging if requested.<a name="line.285"></a>
<span class="sourceLineNo">286</span>     * It is only called for methods with a body.<a name="line.286"></a>
<span class="sourceLineNo">287</span>     *<a name="line.287"></a>
<span class="sourceLineNo">288</span>     * @param method<a name="line.288"></a>
<span class="sourceLineNo">289</span>     *          method to work on<a name="line.289"></a>
<span class="sourceLineNo">290</span>     * @throws NotFoundException<a name="line.290"></a>
<span class="sourceLineNo">291</span>     * @throws CannotCompileException<a name="line.291"></a>
<span class="sourceLineNo">292</span>     */<a name="line.292"></a>
<span class="sourceLineNo">293</span>    private void doMethod(CtBehavior method) throws NotFoundException, CannotCompileException {<a name="line.293"></a>
<span class="sourceLineNo">294</span><a name="line.294"></a>
<span class="sourceLineNo">295</span>        String signature = JavassistHelper.getSignature(method);<a name="line.295"></a>
<span class="sourceLineNo">296</span>        String returnValue = JavassistHelper.returnValue(method);<a name="line.296"></a>
<span class="sourceLineNo">297</span><a name="line.297"></a>
<span class="sourceLineNo">298</span>        if (addEntryExit) {<a name="line.298"></a>
<span class="sourceLineNo">299</span>            String messagePattern = "if ({}.{}()) {}.{}(\"&gt;&gt; {}\");";<a name="line.299"></a>
<span class="sourceLineNo">300</span>            Object[] arg1 = new Object[] { loggerName, levelEnabled, loggerName, level, signature };<a name="line.300"></a>
<span class="sourceLineNo">301</span>            String before = MessageFormatter.arrayFormat(messagePattern, arg1).getMessage();<a name="line.301"></a>
<span class="sourceLineNo">302</span>            // System.out.println(before);<a name="line.302"></a>
<span class="sourceLineNo">303</span>            method.insertBefore(before);<a name="line.303"></a>
<span class="sourceLineNo">304</span><a name="line.304"></a>
<span class="sourceLineNo">305</span>            String messagePattern2 = "if ({}.{}()) {}.{}(\"&lt;&lt; {}{}\");";<a name="line.305"></a>
<span class="sourceLineNo">306</span>            Object[] arg2 = new Object[] { loggerName, levelEnabled, loggerName, level, signature, returnValue };<a name="line.306"></a>
<span class="sourceLineNo">307</span>            String after = MessageFormatter.arrayFormat(messagePattern2, arg2).getMessage();<a name="line.307"></a>
<span class="sourceLineNo">308</span>            // System.out.println(after);<a name="line.308"></a>
<span class="sourceLineNo">309</span>            method.insertAfter(after);<a name="line.309"></a>
<span class="sourceLineNo">310</span>        }<a name="line.310"></a>
<span class="sourceLineNo">311</span>    }<a name="line.311"></a>
<span class="sourceLineNo">312</span>}<a name="line.312"></a>




























































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